Billie Lourd (Scream Queens) took to Instagram on Monday to thank fans for their support after she lost her mother (Star Wars actress Carrie Fisher) and her grandmother (iconic actress Debbie Reynolds) over the course of one day last week.

Lourd, 24, shared a heartbreaking photo showing the three of them, all smiles, at a much younger period.

"Receiving all of your prayers and kind words over the past week has given me strength during a time I thought strength could not exist," she writes in the caption of the photo. "There are no words to express how much I will miss my Abadaba and my one and only Momby. Your love and support means the world to me."

Fisher, who was 60 at the time of her death, passed away on Dec. 27 following a heart attack she suffered days earlier on a flight from London to Los Angeles. She reportedly never regained consciousness.

Following Fisher's death one day later, her mother Debbie Reynolds, 84, also passed away after she was rushed to the hospital for a stroke. Reynolds was reportedly distraught over the loss of her daughter.